If some cylinders have low compression, inject approximately 15 ml (one tablespoon) of engine

GM SPO Group Numbers (cont’d)

Application GM SPO Group Number

PCV Valve Cover 1.745 PCV Valve Elbow 1.762 PCV Valve Grommet 1.745 PCV Valve Hose 1.762 Pin (Oil Pump Locator) 1.723 Piston (with Pin) 0.629 Piston Ring Kit 0.643 Power Steering Pump Bracket 6.606 Secondary Air Injection (AIR) Check Valve 3.670 Secondary Air Injection (AIR) Check Valve Gasket 3.680 Secondary Air Injection (AIR) Check Valve (Crossover) Pipe 3.675 Secondary Air Injection (AIR) Pipe 3.675 Spark Plug 2.270 Spark Plug Wire 2.240 Spark Plug Wire Retainer 2.251 Spark Plug Wire Shield 2.251 Spark Plug Wire Support 2.251 Spring Type S Pin (Crankshaft Rear Oil Seal Housing Locator) 8.940 Square Socket Plug (Engine Block Oil Gallery) 8.971 Throttle Body 3.335 Throttle Body to Upper Manifold Gasket (Included in Service Kits Only) N.S. Upper Intake Manifold (Included in Upper Intake Manifold Kit Only) 3.625 Upper Intake Manifold to Lower Intake Manifold Gasket (Included in Intake Manifold Seal Kit) 3.270 Valve Lifter 0.459 Valve Lifter Guide 0.439 Valve Lifter Guide Retainer 0.439 Valve Pushrod 0.426 Valve Rocker Arm (Included in the Valve Rocker Arm Kit only) N.S. Valve Rocker Arm Ball (Included in the Valve Rocker Arm Kit only) N.S. Valve Rocker Arm Ball Stud 0.429 Valve Rocker Arm Cover 0.386 Valve Rocker Arm Cover Gasket 0.423 Valve Rocker Arm Kit (Includes the Valve Rocker Arm, the Valve Rocker Arm Ball and the Valve Rocker Arm Nut) 0.333 Valve Rocker Arm Nut 0.429 Valve Spring 0.303 Valve Spring Cap 0.309 Valve Stem Key 0.310 Valve Stem Oil Seals 0.308 Water Outlet 1.153 Water Pump Gasket 1.079 Water Pump Inlet Hose 1.097 Water Pump Kit (Includes the Water Pump Gaskets) 1.069 Woodruff Key (Crankshaft Balancer) 8.960